Nik Razborsek advanced when Marc Sieber retired 1-0 in the Turkey F4 round of 16. Nik Razborsek claimed a first win over Marc Sieber in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2018-01-15 | Turkey F2 | R16 | hard | Marc Sieber | 6-3 6-3 |
| 2013-03-04 | Croatia F3 | QF | clay | Marc Sieber | 6-3 6-0 |
Averages over each player's completed matches in the selected window (95 vs 141). ATP, WTA & Challenger.
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About